Mortar-mixer.



G. D. $CHEIFFLER.

MORTAR MIXER.

AIPLIOATION FILED 0012, 1907.

922,724.. Patented May 25, 1909.

UNITED *sTaTne PATENT oisrion.

GEORGE D. SGHEIFFLER, OF JACKSON, MICHIGAN, ASSIGNOR TO HOLTON &WEATHERWAX 00., LTD., OF JACKSON, MICHIGAN.

MORTAR-MIXER.

Specification of Letters Patent.

Patented May 25, 1909.

Application filed Crctober 2, 1907. Serial No. 395,511.

To all whom it may concern:

Be it known that I, GEORGE D. Sonmr- FLER, a citizen of the UnitedStates of America, residing at Jackson, in the county of Jackson andState of Michigan, have invented certain new and useful Improvements inMortar-llclixers; and I do hereby declare the following to be a full,clear, and exact de scription of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

My invention relates to improvements in mortar mixers, and moreparticularly to devices for mixing concrete having therein gravel, smallstones, or other like solid substances. In mixing such material thisgravel or small stones will be liable to clog or break the machine andwill be frequently ammed between the blades of the mixer and the troughof the same to the injury or stoppage of the machine.

The object of my invention is to provide a machine that will mixmaterial for forming concrete having gravel, stones or other small solidmaterial therein and that will not be clogged or injured thereby; and afurtherobject of my invention is to provide means for preventing theadhesion of the material to the trough in which it is mixed. Iaccomplish these results by providing the rotating shaft in the axis ofthe trough with flexible, flat strips radially disposed thereon, and ofsuch length as to engage and traverse the interior of the trough,whereby the strips will yield to any obstruction that may get betweenthem and the trough, such as a small stone and pass over the same,without injury or stoppage, and which will also constantly clear thetrough from any adhering material by scra ing the inner surface thereofand that wil not readily become worn away and fail to contact thetrough.

A further object is to provide a device that may be easily and quicklyrepaired whenever necessary, and to provide the same with various newand useful features, hereinafter more fully described and particularlypointed out in the claims, reference being lad to the accompanyingdrawings, in which:

Figure 1 is a side elevation of a device embodying my invention with apart of the trough or case broken away; Fig. 2 an enlarged plan view ofa ortion of the same with the rotating parts 1n horizontal section;

Fig. 3 a detail of the said parts in end elevation; Fig. 4 a furtherenlarged detail of the sleeve and portions of the flexible strips; Fig.5 a detail showing the inner surface of the sleeve and Fig. 6 a detailin longitudinal section showing the manner of retaining the flexiblestrips in the sleeve.

Like numbers refer to like parts in all of the figures.

1 represents a portion of the feed regulator for supplying material tothe mixer; 2 the mixer trough having a concave inner surface concentricwith the axis of the shaft; 3 the. rotative shaft in the axis of thetrough; 4 a sleeve surrounding the shaft and divided longitudinally intotwo equal parts and secured to the shaft by transverse bolts 6.

Inserted in any number of series of spirally arranged holes in thissleeve (two being shown) are numerous radially projecting, flexible,flat strips 5 preferably of spring steel. These strips are bent inU-shape at the middle and the middle portions span the spaces betweentwo adjacent holes in the sleeve, and the respective ends of the stripsextend radially outward through these holes. When the sleeve is boltedto the shaft, these strips are securely held in the sleeve and extendingradially outward contact and traverse the inner surface of the trough 2at their ends. Being flexible they will yield and bend backward and thusmaintain intimate scraping contact with the trough and constantly removefrom the same any adhering material. By the spiral arrangement of thesestrips they also serve as a conveyer to move the material longitudinallyof the trough and being inserted in the openings with their edgespresented transversely to the direction of the spiral, they engage thematerial edgewise and are thus sufliciently rigid to move the same alongin the trough.

In the event that the gravel or small stones used in the concrete shouldget between the trough and the ends of these strips, the latter beingflexible, will yield and pass over the same, and thus avoid any cloggingor break ing of the machine. I thus provide a device that willsuccessfully and satisfactorily mix concrete having gravel or stonestherein, and

will also keep the trough entirely clear from any adhering material. lVhen these flexible strips eventually become worn so that they are nolonger useful, the sleeve can be easily and quickly detached by removingthe bolts 6 and new strips 5 inserted as occasion requires.

What I claim is:

. 1. In a concrete mixer, the combination of a concave trough, arotative shaft mounted therein, a longitudinally divided sleeve attachedto the shaft and having a series of openings, and a series of flatflexible and superposed strips bent at the middle" and inserted in twoadjacent openings in the sleeve and having their fiat surfaces arrangedspirally to the shaft to move the material longitudinally of the trough.

2. In a concrete mixer, the combination of a concave trough, a rotativeshaft mounted therein, a longitudinally divided sleeve detaohablysecured to the shaft and having one or more spirally arranged rows ofholes, and fiat flexible strips bent at the middle and inserted in twoadjacent holes and with their ends engaging the trough, and their widtharranged transverse to the direction of the spiral of the rows of holes.

In testimony whereof I afliX my signature in presence of two witnesses.

GEORGE D. SGHEIFFLER.

Witnesses VERNE W. BADGLEY, FoRNUT O. BADGLEY.

